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If you have rigid insulation it is difficult to make it fit snug to the closer. I know they act as a vertical DPC but why not just bring the cavity insulation to the edge and have a strip of DPC up the sides?

The cavity closers do hide a multitude of sins (mortar snots, missing insulation, uneven cavity width, missing wall ties) and make plastering simpler and Building Control seem to like them.

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If you have rigid insulation it is difficult to make it fit snug to the closer. I know they act as a vertical DPC but why not just bring the cavity insulation to the edge and have a strip of DPC up the sides?

The cavity closers do hide a multitude of sins (mortar snots, missing insulation, uneven cavity width, missing wall ties) and make plastering simpler and Building Control seem to like them.

The cavity closer acts as a supporting frame for the windows not just as a dpc. Its thermally better to mount the windows within the closer rather than on the outer skin.